If your experience of ski school classes is that they involve too much standing around in lines and not enough skiing, and your private classes didn't feel like value for money either - you still couldn't get the hang of some techniques and the language barrier wasn't helping - it might be worth opting for a clinic.
These tend to be in the form of week-long courses given by an individual instructor. There are quite a few British ones catering for the British market. The courses cater for different levels of ability and tend to be limited to small groups so that the instructor has time to consider each student's technique and diagnose where they are going wrong - down to the finest detail like the type, condition and adjustment of pupils' skis and boots. When did you see that in a conventional ski lesson?
These clinics eliminate language problems, ensure a week of intensive instruction with fellow pupils of roughly the same ability and ambitions, and mean that the psychological aspects of this tricky activity do not get pushed aside.
There are a lot of clinics available now. Most offer instruction half of each day and free-skiing the rest. The whole package will normally include half-board accommodation in whichever resort the clinic is based. As well as standard skiing and boarding clinics, there are a number of specialist ones on the market now including, women's camps, freestyle camps, extreme skiing and riding camps, off-piste powder courses, bumps courses and slalom/racing courses, as well as half-pipe and freestyle snowboard camps.
For more tips and advice on learning to ski: Teaching yourself to ski | Group ski lessons | Private ski lessons | Indoor ski slopes and dry slopes